Improvement in coin-presses



- action, as will be more fully described by reand socket, the motionnecessary in working when the pressure was brought upon the dies THOMASSCOTT, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT lN COlN-PRESSES.-

Specification forming part of Letters Patent No. 21 September 1.596,dated January 21, 1879; application filed 23, 1878.

To all whom it may concern: i

Be it known that I, THOMAS 300m, of the city and county of SanFrancisco, and State of California, have invented an Improvement inCoin-Presses; and I do hereby declare the following to be a full, clear,and exact description thereof, reference being had to the accompanyingdrawings:

My invention relates to certain improvements in that class of presseswhich are intended to be used for coining; and my improvements consistin certain details of construction, and in the mounting of the triangle,whereby I strengthen the press in its different parts and render it moreefficient in its ferring to the accompanying drawings, in which- Figure1 is a view of my improvements, showing their relative positions in thepress. Fig. 2 is a plan view of the triangle. Fig. 3 is a section. Figs.4. and 5 are views of the old form of socket-piece. Figs. 6 and 7 areviews of my improved socket-piece. Fig. 8, Sheet 2, is a view of mydevice.

A great difiiculty has been experienced in the working of coin-presses,because, from the position of the triangle relative to the ball wouldthrow the parts too far out of line, and

it would begin at an angle, so as to have a tendency to produce arocking motion of the dies.. The great strain upon the head of thetriangle is thus apt to spread it, and, from the form of thesocket-piece, the oil which is used in the socket would run downdirectly upon the face of the dies and spoil any impression which mightbe taken.

In the upper part of the arch of a coiningpress is suspended by a pin,A, the beam or lever B, having at its opposite end the journal,intowhich the crank-pin G of the crank C fits.

In Fig. 1 the beam B and crank C are shown in the position they stand inthe press at the moment the coin is struck. The triangle H is also shownin position at that particular point. The center-piece F, having theball E at its lower end,for thepurposehereinafterdescribed, is journaledat the point I to the beam B.

The crank C, which imparts the rocking motion to the beam B, revolves inthe direc tion indicated by the arrows, and when the crank-pin 0 reachesthe point indicated at a the extreme travel of the beam B is reached. Atthis point the lower pin center, I, where the center-piece F isjour'naled to the beam, will have reached the position shown by thedotted circle at b. The upper pin, A, being the center of motion of thebeam, merely turns on its axis, so that the center-piece F, journaled,as described, at b, will have left its vertical position, and the centerline of the same will be represented by the lines marked 0. As, however,the crank continues to rotate and lifts the outer end of the beam, thecenter-piece is brought into a vertical position again, the ball at itslower end fitting tightly into the socket in the end of the triangle andgiving the required pressure.

My triangle H has two trunnions at its broad end, which are fitted inappropriate journals. Its inner end or head fits in the lower part ofthe arch of the press, on top of the stakeseat. The upper part of theapex of this triangle has a steel socket, K, into which fits the ball Eof the center-piece F. A slight rocking motion is imparted to thetriangle in its trunnions, for the purpose hereinafter described.

When the beam and triangle are connected in working the ball and socketwill be in contact, and it will readily be observed that in the case ofthe triangle, trunnioned, as described, that the deviation from line ofcenters is very small, while in the case of triangles of the old styleit is very considerable, owing principally to the journals of itstrunnions being placed so far below the center of the ball and socket.

When the lower die is in position in the press, and a blank placedtherein in the collar ready to be struck, the crank continues its motionin the direction indicated, so that the beam B and center-piece Fgradually approach the line of centers until the upper die, L, held onthe under side of the triangle, touches the blank. The crankpin by thistime is within five inches of the center line, and until the center ispassed-an enormous strain on all the parts takes place. In thismovement, it will be seen that the upper bearing-point, I, of thecenter-piece, in contact with the beam, is, while the coin is beingstruck, moving in or toward the cran k-shaft, while the ball E or low erbearing of the center-piece is moving out or away from the same. Nowthis outward movement is reduced to a minimum in the case of mytriangle, while in the old one it was so considerable that this was oneof the causes why the center-piece gave out so frequently. In mytriangle, however, by raising the bearings for the trunnions thedeviation from the line of center is very slight indeed, as the centerof the trunnion and the center of the ball and socket are on the samehorizontal line.

The set-screws N, for holding the upper die in position, pass throughthe head of the triangle and through the steel socketpiece M. Thisconstruction prevents the set-screws from straining the head, andprevents any oil from working down onto the die while the press isworking.

Fig. 3 shows the method of inserting the steel socket-piece in thetriangle, the recess on the lower side of said socket-piece beingintended for the upper die-seat.

Having thus described my invention, what I claim as new, and desire tosecure byLetters Patent, is-

The improvement in coin presses consisting in the combination, with thebeam and centerpiece,- as described, of the triangle H, having itstrunnions journaied in the same horizontal plane with the center of thesocket K, so that the deviation of the ball and socket from the line ofcenter, caused by the action of the press, shall be reduced to aminimum, sub stantially as herein described.

In witness whereof I have hereunto set my hand.

THOMAS SCOTT.

Witnesses:

GEO. H. STRONG, FRANK A. BRooKs.

